A magnetic particle flaw detector for inspecting defects of a shell of a cannonball

Abstract

The application relates to the technical field of magnetic particle flaw detection, in particular to a magnetic particle flaw detector for shell defect inspection of a cannonball, which comprises a base, a flaw detection inspection area, a magnetizing ring and a telescopic clamp, and further comprises a frame assembly, a moving assembly, a damping absorption assembly, an elastic buffering assembly and a guide wheel assembly; the frame assembly is arranged at one end of the telescopic clamp far from the flaw detection inspection area; through the cooperative mode of the frame assembly, the moving assembly, the damping absorption assembly, the elastic buffering assembly and the guide wheel assembly, the problems that, in the prior art, the cannonball shell produces radial runout due to tolerance, eccentricity and coaxiality error when rotating for flaw detection, and further causes unstable magnetic mark display and decreased defect identification precision are solved; the magnetic particle flaw detector has the effects of being capable of self-adaptively absorbing radial runout energy, limiting radial floating amplitude and improving the stability of a magnetic particle flaw detection process.

Description

Technical Field

[0001] This invention relates to the field of magnetic particle testing technology, specifically to a magnetic particle testing machine for inspecting defects in artillery shell casings. Background Technology

[0002] With the development of thermal weapon manufacturing technology, after the shell casing has undergone heat treatment, machining and surface finishing, it is usually necessary to use a magnetic particle flaw detector to conduct non-destructive testing on the surface of the produced shell casing to check for defects such as cracks, inclusions, and porosity, so as to ensure the service safety of each link in the ammunition weapon system. Currently, conventional magnetic particle inspection machines are commonly used in industry to inspect shell casings. These machines operate primarily through their clamps and magnetization devices. Their ability to apply magnetic powder or magnetic suspension to the rotating shell casing is sufficient to meet the inspection requirements of shell casings of a single specification. However, when performing mixed-line inspections on shell casings of different specifications, the clamping distance needs to be frequently adjusted due to the different specifications of the shell casings. As conventional clamps have a fixed adaptability in terms of length and diameter, these magnetic particle inspection machines will inevitably experience frequent issues such as electrodes failing to clamp properly and magnetization positions shifting.

[0003] Although existing technologies have introduced retractable clamping mechanisms that allow the electrodes at both ends to automatically adjust and rotate according to the length of the projectile, as the projectile casing continues to rotate during the flaw detection process, slight radial runout will still occur due to manufacturing tolerances, mass eccentricity, and minor coaxiality errors at the clamping end. Although the amplitude of this radial runout is usually small and insufficient to affect the normal rotation of the projectile casing, magnetic particle flaw detection is a highly sensitive detection process. The display of magnetic traces, visual acquisition, and defect identification on the surface of the projectile casing all rely on a stable spatial position. The slight radial runout will also cause periodic slight displacement of the detection area relative to the fixed spraying mechanism, magnetization mechanism, and visual inspection mechanism, resulting in local fluctuations in the thickness of the magnetic suspension film, slight drift in the position of the magnetic traces, and a decrease in the continuity of the visual acquisition image. Especially during continuous rotation detection, the above effects will accumulate and ultimately reduce the display stability and identification accuracy of fine defects.

[0004] Therefore, a magnetic particle flaw detector for inspecting defects in artillery shell casings is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a magnetic particle inspection machine for inspecting defects in artillery shells. By coordinating a frame assembly, a moving assembly, a damping absorption assembly, an elastic buffer assembly, and a guide wheel assembly, it solves the problem in the prior art where radial runout of the artillery shell due to tolerance, eccentricity, and coaxiality errors during rotary inspection leads to unstable magnetic trace display and reduced defect identification accuracy. The machine has the effect of adaptively absorbing radial runout energy, limiting the radial fluctuation amplitude, and improving the stability of the magnetic particle inspection process.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A magnetic particle inspection machine for inspecting defects in artillery shell casings includes a base, an inspection area, a magnetizing ring, and a telescopic clamp. It also includes a frame assembly, a moving assembly, a damping absorption assembly, an elastic buffer assembly, and a guide wheel assembly. The frame assembly is located at the end of the telescopic clamp furthest from the inspection area. The moving assembly is located on the left and right sides inside the inspection area, with its ends extending into the inspection area and connecting to the frame assembly. The damping absorption assembly is installed at the end of the frame assembly furthest from the inspection area, and is arranged in a circular array along the center of the frame assembly. The elastic buffer assembly is positioned relative to the damping absorption assembly. At the bottom of the center position, the guide wheel assembly is located at the end of the elastic buffer assembly away from the damping absorption assembly. When the telescopic clamp holds the shell casing for rotational flaw detection, the moving assembly drives the frame assembly to adjust synchronously to the corresponding position, so that the guide wheel assembly rolls with the outer circumference of the shell casing. When the shell casing generates radial runout during the rotation of the telescopic clamp, the elastic buffer assembly drives the guide wheel assembly to generate a compensating displacement, and the damping absorption assembly absorbs the vibration energy generated during the movement of the guide wheel assembly, so as to reduce the radial floating amplitude during the rotation of the shell casing and improve the stability of magnetic trace display and the accuracy of defect identification during magnetic particle flaw detection.

[0007] Preferably, the frame assembly includes an outer ring, an inner ring, and cross rollers. The outer ring is disposed at the end of the retractable clamp away from the flaw detection area. The inner ring is disposed on the inner circumference of the outer ring, and its end near the flaw detection area is in contact with the end of the retractable clamp. The cross rollers are disposed on the outer circumference of the inner ring and are connected to the inner circumference of the outer ring.

[0008] Preferably, the movable component includes a connecting groove, a connecting rod, and a built-in spring. The connecting groove is located on the left and right sides inside the flaw detection and inspection area, and is arranged in a circular array with the telescopic clamp as the center. The connecting rod is fixed to one end of the outer ring near the flaw detection and inspection area and is slidably connected to the connecting groove. It is also arranged in a circular array along the center of the outer ring. The built-in spring is sleeved on the outer periphery of the connecting rod and is located inside the connecting groove.

[0009] Preferably, the damping absorption assembly includes a fixed base, a hydraulic cylinder, a through hole, and a piston rod. The fixed base is fixed at the end of the outer ring away from the flaw detection area, and is arranged in a circular array along the center of the outer ring. The hydraulic cylinder is fixed at the bottom end of the fixed base relative to the center of the outer ring. The through hole is opened at the end of the hydraulic cylinder away from the fixed base. The piston rod is disposed inside the hydraulic cylinder, and its end near the center of the outer ring passes through the through hole.

[0010] Preferably, an oil passage hole is provided through one end of the piston rod near the fixed seat, and the oil passage holes are distributed in a circular array along the center of the piston rod, and the inside of the cylinder is filled with damping oil.

[0011] Preferably, the elastic buffer assembly includes a lower pressure plate and a disc spring assembly. The lower pressure plate is fixed to one end of the piston rod near the center of the outer ring, and the disc spring assembly is sleeved on the outer circumference of the piston rod, with its two ends connected to the oil cylinder and the lower pressure plate, respectively.

[0012] Preferably, a limiting seat is fixed at the end of the fixed seat near the oil cylinder, a limiting block is fixed on the outer periphery of the lower pressure plate and engages with the limiting seat, guide grooves are symmetrically opened on both sides of the limiting block, and guide rails are symmetrically fixed on both sides inside the limiting seat, and the guide rails are slidably connected to the guide grooves.

[0013] Preferably, the guide wheel assembly includes a support arm and a guide wheel, the support arm is fixed to the end of the lower pressure plate away from the oil cylinder, and the guide wheel is rotatably connected inside the support arm.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When the retractable clamp holds the shell casing for rotational flaw detection, the moving component drives the frame component to move synchronously toward the shell casing, ensuring that the guide wheel component always maintains a positional relationship with the outer periphery of shell casings of different specifications. At the same time, the inner ring of the frame component rotates synchronously with the retractable clamp, while the outer ring rotates relative to the inner ring through cross rollers. This isolates the rotational load generated by the retractable clamp from the subsequent guiding compensation mechanism, preventing additional vibrations caused by the synchronous rotation of the guide wheel component with the retractable clamp. This allows the guide wheel component to stably fit against the outer periphery of the shell casing, thereby improving the operational stability of the shell casing during rotation and helping to ensure the continuity of magnetic trace display and the accuracy of defect identification during magnetic particle flaw detection.

[0015] 2. When the shell casing experiences radial floating due to manufacturing errors, clamping errors, or mass eccentricity during rotation, the guide wheel is squeezed by the outer circumference of the shell casing, causing the support arm and lower pressure plate to move synchronously. This causes the disc spring assembly to undergo compression deformation, thereby elastically buffering the impact load generated by the radial floating of the shell casing and enabling the guide wheel to compensate for displacement changes with the outer circumference of the shell casing. When the radial floating decreases, the disc spring assembly releases elastic potential energy to push the lower pressure plate and guide wheel to gradually return to their original positions, ensuring that the guide wheel always maintains rolling contact with the outer circumference of the shell casing. This effectively reduces the impact phenomenon caused by changes in the gap between the guide wheel and the shell casing, thereby improving the guiding stability and compensation accuracy during the rotating flaw detection process of the shell casing.

[0016] 3. When the guide wheel moves radially with the shell casing and generates a compensating displacement, the piston rod moves synchronously inside the cylinder, causing the damping oil to flow through the oil passage. Due to the throttling effect of the oil passage on the damping oil, a stable hydraulic damping force is generated, which limits the movement speed of the guide wheel. At the same time, the limit block slides within the limit seat along the guide trajectory formed by the cooperation of the guide rail and the guide groove, so that the lower pressure plate always moves stably in the preset direction, avoiding the guide wheel from swaying and tilting during the compensation process. This effectively suppresses the rapid rebound and reciprocating vibration of the guide wheel, reduces the impact of radial runout during the shell casing rotation on the flaw detection results, and further improves the stability, reliability, and defect detection rate of magnetic particle flaw detection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the diagram; Figure 4 This is an exploded view of the frame component structure of the present invention; Figure 5 This is a schematic diagram of the guide wheel assembly structure of the present invention; Figure 6 This is a cross-sectional view of the guide wheel assembly structure of the present invention; Figure 7 This is an exploded view of the elastic buffer component structure of the present invention; Figure 8 This is an exploded cross-sectional view of the elastic buffer component structure of the present invention.

[0018] In the diagram: 1. Base; 2. Flaw detection inspection area; 3. Magnetizing ring; 4. Telescopic clamp; 5. Frame assembly; 51. Outer ring; 52. Inner ring; 53. Cross roller; 6. Moving assembly; 61. Connecting groove; 62. Connecting rod; 63. Built-in spring; 7. Damping absorption assembly; 71. Fixed seat; 72. Hydraulic cylinder; 73. Through hole; 74. Piston rod; 741. Oil passage hole; 8. Elastic buffer assembly; 81. Lower pressure plate; 811. Limit seat; 8111. Guide groove; 812. Limit block; 8121. Guide rail; 82. Disc spring assembly; 9. Guide wheel assembly; 91. Support arm; 92. Guide wheel. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1 to 8 This invention provides a magnetic particle flaw detector for inspecting defects in artillery shell casings, the technical solution of which is as follows: Reference Figure 1 , Figure 2 , Figure 3 and Figure 4A magnetic particle inspection machine for inspecting defects in artillery shell casings includes a base 1, an inspection area 2, a magnetizing ring 3, and a telescopic clamp 4. The base 1 provides a stable platform for the inspection area 2, which is used to inspect artillery shell casings. The magnetizing ring 3 magnetizes the shell casings to be inspected. The telescopic clamp 4 clamps both ends of the shell casing and uses its own drive mechanism to rotate the shell casing around its own axis to achieve positioning and full-circumferential inspection of the shell casing. The machine also includes a frame assembly 5, a moving assembly 6, a damping absorption assembly 7, an elastic buffer assembly 8, and a guide wheel assembly 9. The frame assembly 5 is located at the end of the telescopic clamp 4 furthest from the inspection area 2. The frame assembly 5 includes the damping absorption assembly 7 and the elastic buffer assembly 8. Component 8 and guide wheel assembly 9 provide the mounting base, forming a stable compensation platform while isolating the motion from the rotating clamp. The moving component 6 is located on the left and right sides inside the flaw detection area 2, with its ends extending into the flaw detection area and connecting to the frame assembly 5. The moving component 6 drives the frame assembly 5 to synchronously follow the retractable clamp 4 towards or away from the shell casing. The damping absorption component 7 is installed at the end of the frame assembly 5 away from the flaw detection area 2, and it is arranged in a circular array along the center of the frame assembly 5. The damping absorption component 7 absorbs the impact and vibration energy generated during the movement of the guide wheel assembly 9, thereby suppressing the rebound of the guide wheel assembly 9, reducing high-frequency vibration, and improving compensation stability. The elastic buffer component 8 is located at the damping absorption... At the bottom of the receiving component 7 relative to the center of the frame component 5, the elastic buffer component 8 is used to quickly follow and compensate for changes in the outer circle of the shell casing, ensuring that the guide wheel component 9 continuously contacts the outer circle of the shell casing for real-time support. The guide wheel component 9 is located at the end of the elastic buffer component 8 away from the damping absorption component 7. The guide wheel component 9 rolls in contact with the outer circumference of the shell casing, transmitting radial changes of the shell casing to the compensation mechanism, while simultaneously forming a flexible guiding support for the outer circumference of the shell casing. When the telescopic clamp 4 holds the shell casing for rotational flaw detection, the moving component 6 drives the frame component 5 to adjust synchronously to the corresponding position, so that the guide wheel component 9 rolls in contact with the outer circumference of the shell casing. When the shell casing experiences radial runout during the rotation of the telescopic clamp 4, the elastic buffer component 8 drives the guide wheel component. 9 generates a compensating displacement, and the damping absorption component 7 absorbs the vibration energy generated during the movement of the guide wheel assembly 9, so as to reduce the radial floating amplitude during the rotation of the shell casing, improve the stability of magnetic trace display and the accuracy of defect identification during magnetic particle inspection. When the telescopic clamp 4 clamps the shell casing and performs rotational inspection under the drive mechanism, the moving component 6 drives the frame assembly 5 to move synchronously to the corresponding position, and the three sets of guide wheel assemblies 9 form rolling contact with the outer periphery of the shell casing. When the shell casing floats radially due to manufacturing error, clamping error or mass eccentricity, the guide wheel assembly 9 first moves with the shell casing, and the elastic buffer component 8 undergoes elastic deformation and provides continuous preload, so that the guide wheel assembly 9 always remains in contact with the outer periphery of the shell casing.Meanwhile, the damping absorption component 7 absorbs and dissipates the vibration energy generated during the movement of the guide wheel assembly 9, thereby suppressing the rebound and vibration amplification of the guide wheel assembly 9, making the shell casing rotation process more stable, and improving the stability of magnetic trace display and the accuracy of defect identification during magnetic particle inspection. Under normal conditions: the guide wheel assembly 9 gently presses against the outer circle of the shell casing under the action of preload, the elastic buffer assembly 8 provides the basic preload, and at this time the damping absorption assembly 7 is in the middle to lower position; Under slight disturbance: when the shell casing generates a small radial float during rotation, the guide wheel assembly 9 moves inward, the elastic buffer assembly 8 is compressed, and thus quickly provides a reaction force to absorb the small radial displacement. Under large disturbances: the radial float of the shell casing increases when it rotates, exceeding the working range of the elastic buffer assembly 8 (disc spring assembly 82), and the piston rod 74 continues to compress. At this time, the damping absorption assembly 7 starts to work, and the oil throttling generates damping, absorbs a large amount of energy, and suppresses vibration. After the disturbance is eliminated: After the force is released, the damping absorption component 7 returns to oil under the action of the elastic buffer component 8, the disc spring assembly 82 rebounds, and the guide wheel assembly 9 returns to its initial position, waiting for the next inspection disturbance to be compensated.

[0021] Reference Figure 1 , Figure 3 and Figure 4 In one embodiment of the present invention, the frame assembly 5 specifically includes an outer ring 51, an inner ring 52, and a cross roller 53. The outer ring 51 is disposed at the end of the telescopic clamp 4 away from the flaw detection area 2. The inner ring 52 is disposed on the inner circumference of the outer ring 51, and its end near the flaw detection area 2 is in contact with the end of the telescopic clamp 4. The cross roller 53 is disposed on the outer circumference of the inner ring 52 and is connected to the inner circumference of the outer ring 51. Through the cooperative arrangement of the outer ring 51, the inner ring 52, and the cross roller 53, the rotational movement of the telescopic clamp 4 is restricted to the inner ring 52 side, and the outer ring 51 remains relatively stationary, thereby achieving rotational movement isolation and improving the ability of the frame assembly 5 to withstand radial loads, axial loads, and overturning moments, reducing the transmission of rotational loads to the guide compensation mechanism, and improving the stability and reliability of the guide compensation process.

[0022] Reference Figure 1 , Figure 2 and Figure 3In one embodiment of the present invention, the movable component 6 specifically includes a connecting groove 61, a connecting rod 62, and a built-in spring 63. The connecting groove 61 is located on the left and right sides inside the flaw detection area 2, and is arranged in a circular array with the telescopic clamp 4 as the center. The connecting rod 62 is fixed to one end of the outer ring 51 near the flaw detection area 2 and is slidably connected to the connecting groove 61, and is arranged in a circular array along the center of the outer ring 51. The built-in spring 63 is sleeved on the outer periphery of the connecting rod 62 and is located inside the connecting groove 61. Through the cooperative arrangement of the connecting groove 61, the connecting rod 62, and the built-in spring 63, the frame component 5 can form a synchronous linkage with the telescopic clamp 4. When the telescopic clamp 4 adjusts the clamping range, automatic adaptation can be completed without adjusting the position of the guide compensation mechanism separately. This not only improves the clamping efficiency of shell casings of different specifications, but also ensures that the guide wheel component 9 is always in the optimal guiding position, providing a stable foundation for subsequent radial compensation and vibration suppression.

[0023] Reference Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In one embodiment of the present invention, the damping absorption assembly 7 specifically includes a fixed base 71, a hydraulic cylinder 72, a through hole 73, and a piston rod 74. The fixed base 71 is fixed at the end of the outer ring 51 away from the flaw detection area 2, and is arranged in a circular array along the center of the outer ring 51. The hydraulic cylinder 72 is fixed at the bottom end of the fixed base 71 relative to the center of the outer ring 51. The through hole 73 is opened at the end of the hydraulic cylinder 72 away from the fixed base 71. The piston rod 74 is disposed inside the hydraulic cylinder 72, and its end near the center of the outer ring 51 passes through the through hole 73. When the shell casing rotates under the action of the telescopic clamp 4... During flaw detection, if the shell casing experiences radial floating due to manufacturing errors, clamping errors, or mass eccentricity, the guide wheel assembly 9 will be squeezed by the outer circumference of the shell casing and generate radial displacement. This displacement is transmitted to the piston rod 74 through the subsequent structure, causing the piston rod 74 to move axially along the through hole 73. The hydraulic cylinder 72 remains stable under the support of the fixed seat 71, thereby creating relative motion between the piston rod 74 and the hydraulic cylinder 72. This creates conditions for the damping medium to generate damping effect, thereby reducing the impact and vibration of the guide wheel assembly 9 caused by radial floating and improving the operational stability and detection accuracy during the shell casing rotation flaw detection process.

[0024] Reference Figure 6 , Figure 7 and Figure 8In one embodiment of the present invention, specifically, an oil passage hole 741 is provided through one end of the piston rod 74 near the fixed seat 71. The oil passage holes 741 are arranged in a ring array along the center of the piston rod 74, and the inside of the oil cylinder 72 is filled with damping oil. By providing an oil passage hole 741 on the piston rod 74 and filling the inside of the oil cylinder 72 with damping oil, the piston rod 74 can drive the damping oil to flow in the oil passage hole 741 and form a throttling resistance when it moves. This allows the absorption and dissipation of impact load and vibration energy during the movement of the guide wheel assembly 9, reduces the rebound amplitude of the guide wheel assembly 9, improves the following stability of the guide wheel assembly 9 to the radial floating of the shell casing, and further improves the continuity of magnetic trace display and the accuracy of defect identification during the magnetic particle inspection of the shell casing.

[0025] Reference Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In one embodiment of the present invention, the elastic buffer assembly 8 specifically includes a lower pressure plate 81 and a disc spring assembly 82. The lower pressure plate 81 is fixed to one end of the piston rod 74 near the center of the outer ring 51. The disc spring assembly 82 is sleeved on the outer circumference of the piston rod 74, and its two ends are respectively connected to the oil cylinder 72 and the lower pressure plate 81. Through the cooperation of the lower pressure plate 81 and the disc spring assembly 82, when the guide wheel 92 is subjected to the radial floating action of the shell casing, it can first be elastically buffered by the disc spring assembly 82. The disc spring assembly 82 provides continuous preload and automatic reset force, so that the guide wheel 92 always maintains a rolling contact state with the outer circumference of the shell casing. This provides a stable motion basis for the subsequent vibration dissipation of the damping absorption assembly 7, thereby reducing the influence of the radial runout during the rotation of the shell casing on the flaw detection results and improving the stability and accuracy of magnetic particle flaw detection.

[0026] Reference Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 8In one embodiment of the present invention, specifically, a limiting seat 811 is fixed at the end of the fixed seat 71 near the oil cylinder 72, and a limiting block 812 is fixed on the outer periphery of the lower pressure plate 81 and engaged with the limiting seat 811. Guide grooves 8111 are symmetrically opened on both sides of the limiting block 812, and guide rails 8121 are symmetrically fixed on both sides inside the limiting seat 811. The guide rails 8121 are slidably connected with the guide grooves 8111. Through the cooperative arrangement of the limiting seat 811, the limiting block 812, the guide grooves 8111 and the guide rails 8121, the lower pressure plate 81 can only reciprocate along the axial direction of the piston rod 74 when subjected to the load transmitted by the guide wheel 92. This avoids the lower pressure plate 81 and the guide wheel 92 from swaying and tilting, ensuring that the disc spring assembly 82 is subjected to uniform force and the piston rod 74 moves stably. This improves the following accuracy and compensation stability of the guide wheel 92 for the radial floating of the shell casing, thereby improving the operational reliability and detection accuracy of the shell casing magnetic particle inspection process.

[0027] Reference Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In one embodiment of the present invention, the guide wheel assembly 9 specifically includes a support arm 91 and a guide wheel 92. The support arm 91 is fixed to the end of the lower pressure plate 81 away from the oil cylinder 72, and the guide wheel 92 is rotatably connected inside the support arm 91. By setting the support arm 91 and the guide wheel 92, the guide wheel 92 can form a rolling contact with the outer periphery of the shell, and transmit the radial floating generated during the rotation of the shell to the elastic buffer assembly 8 and the damping absorption assembly 7 in a timely manner. At the same time, the guide wheel 92 can rotate freely relative to the support arm 91, thereby reducing the frictional resistance and wear between the guide wheel 92 and the shell, improving the sensitivity and stability of the guiding compensation process, and thus reducing the impact of the radial runout during the rotation of the shell on the magnetic particle inspection results, and improving the accuracy and reliability of defect detection.

[0028] Working principle: Before performing mixed-line flaw detection on shell casings of different specifications, the telescopic clamp 4 adjusts the clamping distance at both ends according to the length of the shell casing to be tested. During this process, the frame assembly 5 is pulled by the moving assembly 6 and will synchronously adjust its position with the clamping end of the telescopic clamp 4, so that the guide wheel assembly 9 distributed in a ring array can always correspond and match with the outer periphery of the shell casing to be tested. During the test, after the telescopic clamp 4 clamps the shell casing and completes the clamping, the telescopic clamp 4 drives the shell casing to rotate to start the flaw detection operation. When the shell casing has radial runout due to manufacturing tolerance, mass eccentricity, or coaxiality error, the outward runout part will squeeze the corresponding The guide wheel assembly 9 transmits the force to the elastic buffer assembly 8 and the damping absorption assembly 7. During this process, the vibration energy generated by radial runout is absorbed by the damping absorption assembly 7, and displacement compensation is automatically completed by the elastic thrust of the elastic buffer assembly 8. The multiple guide wheel assemblies 9 are always evenly pressed against the shell casing in the circumference. Without affecting the normal rotation of the shell casing, the radial floating amplitude during the rotation of the shell casing is greatly reduced, so that the outer surface of the shell casing is always in a stable spatial position. This avoids fluctuations in the thickness of the magnetic suspension liquid film and drift of the magnetic trace position, ensures the continuity of the visual acquisition image, and improves the display stability and recognition accuracy of micro-defects.

[0029] Specifically, the telescopic clamp 4 clamps the shell casing by bringing them closer together. During this process, the outer ring 51 slides and compresses the built-in spring 63 inside the connecting groove 61 via the connecting rod 62, causing the outer ring 51 to move synchronously with the clamping end of the telescopic clamp 4 to adjust its position. This ensures that the guide wheels 92 distributed in a ring array can always correspond and match with the outer circumference of the shell casing to be inspected. Subsequently, the telescopic clamp 4 drives the shell casing to rotate to begin the flaw detection operation. Through the cross rollers 53 set between the inner ring 52 and the outer ring 51, the telescopic clamp 4 is rotated and isolated by the inner ring 52, allowing the outer ring 51 to stably perform radial compensation without shaking. When the shell casing produces radial runout, the outward runout part will squeeze the corresponding guide wheel 92. The guide wheel 92 transmits the force to the lower pressure plate 81 and piston rod 74 through the support arm 91. When the piston rod 74 moves, it squeezes the disc spring assembly 82 through the lower pressure plate 81 and moves along the oil... As cylinder 72 retracts away from the center of the shell, the damping oil inside cylinder 72 is squeezed by piston rod 74 and flows through oil passage 741 to the other side of piston rod 74. The damping effect generated during the flow absorbs and dissipates the vibration energy transmitted by guide wheel 92. Subsequently, disc spring assembly 82 pushes piston rod 74 to reset, causing guide wheel to press against the outer circumference of shell again, completing the compensation for jump displacement. During this process, the vibration energy generated by radial jump is absorbed by the damping effect of damping oil, and displacement compensation is automatically completed by the elastic thrust of disc spring assembly 82. This ensures that multiple guide wheels are always evenly pressed against the circumference of shell, significantly reducing the radial floating amplitude of shell during rotation without affecting the normal rotation of shell, keeping the outer surface of shell in a stable spatial position, avoiding fluctuations in the thickness of magnetic suspension film and drift of magnetic trace position, ensuring the continuity of visual acquisition images, and improving the display stability and recognition accuracy of micro-defects.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A magnetic particle inspection machine for inspecting defects in artillery shell casings, comprising a base, an inspection area, a magnetizing ring, and a retractable clamp, characterized in that: It also includes a frame assembly, a moving assembly, a damping absorption assembly, an elastic buffer assembly, and a guide wheel assembly. The frame assembly is located at the end of the telescopic clamp away from the flaw detection area. The moving assembly is located on the left and right sides inside the flaw detection area, with its ends extending into the flaw detection area and connecting to the frame assembly. The damping absorption assembly is installed at the end of the frame assembly away from the flaw detection area, and it is distributed in a circular array along the center of the frame assembly. The elastic buffer assembly is located at the bottom of the damping absorption assembly relative to the center of the frame assembly. The guide wheel assembly is located at the end of the elastic buffer assembly away from the damping absorption assembly. When the telescopic clamp holds the shell casing for rotational flaw detection, the moving assembly drives the frame assembly to synchronously adjust to the corresponding position, so that the guide wheel assembly rolls with the outer circumference of the shell casing. When the shell casing generates radial runout during the rotation of the telescopic clamp, the elastic buffer assembly drives the guide wheel assembly to generate compensating displacement, and the damping absorption assembly absorbs the vibration energy generated during the movement of the guide wheel assembly, thereby reducing the radial floating amplitude during the rotation of the shell casing and improving the stability of magnetic trace display and defect identification accuracy during magnetic particle flaw detection. The frame assembly includes an outer ring, an inner ring, and crossed rollers. The outer ring is disposed at the end of the retractable clamp away from the flaw detection area. The inner ring is disposed on the inner circumference of the outer ring, and its end near the flaw detection area is in contact with the end of the retractable clamp. The crossed rollers are disposed on the outer circumference of the inner ring and are connected to the inner circumference of the outer ring. The damping and absorption assembly includes a fixed base, a hydraulic cylinder, a through hole, and a piston rod; The elastic buffer assembly includes a lower pressure plate and a disc spring assembly. The lower pressure plate is fixed to one end of the piston rod near the center of the outer ring. The disc spring assembly is sleeved on the outer circumference of the piston rod, and its two ends are respectively connected to the oil cylinder and the lower pressure plate.

2. A magnetic particle flaw detector for inspecting defects in shell casings according to claim 1, characterized in that: The movable component includes a connecting groove, a connecting rod, and a built-in spring. The connecting groove is located on the left and right sides inside the flaw detection and inspection area, and is arranged in a circular array with the telescopic clamp as the center. The connecting rod is fixed to one end of the outer ring near the flaw detection and inspection area and is slidably connected to the connecting groove. It is also arranged in a circular array along the center of the outer ring. The built-in spring is sleeved on the outer periphery of the connecting rod and is located inside the connecting groove.

3. A magnetic particle flaw detector for inspecting defects in shell casings according to claim 1, characterized in that: The fixing seat is fixed at the end of the outer ring away from the flaw detection area, and it is arranged in a ring array along the center of the outer ring. The oil cylinder is fixed at the bottom end of the fixing seat relative to the center of the outer ring. The through hole is opened at the end of the oil cylinder away from the fixing seat. The piston rod is located inside the oil cylinder, and its end near the center of the outer ring passes through the through hole.

4. A magnetic particle flaw detector for inspecting defects in shell casings according to claim 3, characterized in that: An oil passage hole is provided at one end of the piston rod near the fixed seat. The oil passage holes are arranged in a circular array along the center of the piston rod. The inside of the cylinder is filled with damping oil.

5. A magnetic particle flaw detector for inspecting defects in shell casings according to claim 4, characterized in that: A limiting seat is fixed at the end of the fixed seat near the oil cylinder. A limiting block that engages with the limiting seat is fixed on the outer periphery of the lower pressure plate. Guide grooves are symmetrically opened on both sides of the limiting block. Guide rails are symmetrically fixed on both sides inside the limiting seat. The guide rails are slidably connected to the guide grooves.

6. A magnetic particle flaw detector for inspecting defects in shell casings according to claim 5, characterized in that: The guide wheel assembly includes a support arm and a guide wheel. The support arm is fixed to the end of the lower pressure plate away from the oil cylinder, and the guide wheel is rotatably connected inside the support arm.

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